Checklan Central Admin is the easiest and powerful way to inventory all your Windows domains. You can inventory Operating Systems, Disks on your networks, enumerate local users and groups on each server or workstation, machine configuration as Bios memory, softwares, AT jobs with detailed informations.
No limit for the number of Servers and PCs you can inventory.

Checklan Central Admin inventory all what you are able to see in "My Network Place", to connect from file method, to collect in Active Directory or to use IP ranges.
No matter if computers you are inventorying are located on Internet in a workgroup, behing a ADSL router anywhere in the world as long as you have administrator rights on these computers.